Usnea in Baltic countries

	Key to the Usnea species in the Baltic countries
	Identification key of 16 species, maximum length – 17 steps

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	Branches even in thickness, slendering gradually towards the apices; without foveolae and/or ridges; fibrils usually numerous; isidiomorphs always present, usually abundant; medulla dense
	Branches uneven in thickness, often with foveolae and/or ridges; fibrils sparse to numerous; isidiomorphs absent or sparse; medulla loose

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	Species in the key articulata \| barbata \| ceratina \| chaetophora \| dasypoga \| diplotypus \| florida \| fulvoreagens \| glabrata \| glabrescens \| hirta \| lapponica \| longissima \| subfloridana \| substerilis \| wasmuthii